Service manual

13-9
TROUBLESHOOTING
SM DNGDCI 2-E.1 GB
No Symptom Probable Cause Corrective Action
7
One indoor unit or more are
operating in cool mode with no
capacity, and the other units have
water leaks/freezing problems
The communication
wires of the indoor units
are switched
Check and correct the
communication wires
connection
8
One indoor or more are operating
in heat mode with a limited
capacity, and the coil on the other
units are very hot.
9
Outdoor unit display board and
leds are off
No power supply
Check the connections
and the wiring on the main
terminal - Repair if needed.
PFC Chock coil Check the PFC Chock coil
Burnt fuse Check 20A fuse on the Filter
10
Compressor operates but one or
more units generates no capacity
EEV problem Check EEV
Refrigerant leakage Check refrigeration system
Indoor coil block
Clean filters and/or remove
block
Outdoor coil block
Remove block and/or avoid
air by-pass
11
Compressor is over heated and
unit does not generate capacity
EEV problem Check EEV
Refrigerant leakage Check refrigeration system)
Indoor coil block
Clean filters and/or remove
block
Outdoor coil block
Remove block and/or avoid
air by-pass
12
Compressor stops during
operation
Electronic control Check diagnostics
Refrigerant leakage Check refrigeration system
13
Not all units are operating
Communication
problems
Check diagnostics
14
Compressor does not start
Electronics control
problem or protection
15
Unit works in wrong mode (cool
instead of heat or heat instead of
cool)
Electronics or RV
problem
Check RV
16
All components are operating
properly but no cooling or no
heating
Refrigerant leak Check refrigeration system
17
Compressor motor is generating
noise and no suction occurs
Phase order to
compressor is wrong
Check compressor phase
order
18
Freezing of outdoor unit in heat
mode and outdoor unit base is
blocked with ice
Connect base heater
CONTENT